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| Engine, Transmission and Drivetrain Discuss Engine, Transmission, Drivetrain, and all other performance modifications here. |
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#1
11-28-2007, 12:31 AM
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stock crankshaft- 420a
how much horsepower/ rpms can a stock crank handle with low comp. pistons and a turbo?
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#2
11-28-2007, 12:48 AM
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Re: stock crankshaft- 420a
I know next to nothing about the 420a motors but if you are already doing new pistons and rods (as im sure you know the stock ones dont go well with boost) why not do the crank while your at it?
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#3
11-28-2007, 01:18 AM
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Re: stock crankshaft- 420a
You'd be better off asking this question at 2gnt.com. I know they are pretty strong and can handle a good amount of HP but I can't give you an exact number, not too many guys on here have turbo'd the 420a.
Why though, what mods are you planning for?
__________________
95 Talon TSI AWD 97 Eclipse GST 
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#4
11-28-2007, 07:14 AM
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Re: stock crankshaft- 420a
The stock crank is fine. To this day I have never heard of anyone breaking a crank because of to much hp.
__________________
98 Eclipse GS Turbo Megasquirt 2 - Holset HY35 Turbo - Built motor - P&P Head and Intake - 3" Turbo back - FMIC - Greddy RZ BOV - Walbro 255 - Aeromotive AFPR - 650cc Injectors - Fidanza Flywheel - Zoom clutch - 13" Cobra Front Brakes - AEM WB - Devilsown meth injection - 3.55 Final Drive gear ratio 1981 Chevy Scottsdale 1987 Nissan 300zx - Chump Car 2001 BMW 325i - DD
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#6
11-30-2007, 09:09 AM
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stock crankshaft- 420a
So i don't have to worry about hp, but how many rpm's? I should be worrying about the rods first right?
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#7
11-30-2007, 10:49 AM
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Re: stock crankshaft- 420a
Unless your building a motor that is going to rev over 8k you should be fine. Pistons and rods are the weakest link in these motors.
__________________
98 Eclipse GS Turbo Megasquirt 2 - Holset HY35 Turbo - Built motor - P&P Head and Intake - 3" Turbo back - FMIC - Greddy RZ BOV - Walbro 255 - Aeromotive AFPR - 650cc Injectors - Fidanza Flywheel - Zoom clutch - 13" Cobra Front Brakes - AEM WB - Devilsown meth injection - 3.55 Final Drive gear ratio 1981 Chevy Scottsdale 1987 Nissan 300zx - Chump Car 2001 BMW 325i - DD
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#8
11-30-2007, 01:35 PM
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Re: stock crankshaft- 420a
You may just want to make sure the crankshaft is balanced when doing a rebuild, but the stocker is fine for about 8k rpm and ~400hp or so IIRC. Even then, it could still probably hold up to even more. Cranks are strong... they have to be. As Silver said, the rods/pistons are weak. They're moving all over the place and held into position by basically one part. The crank on the otherhand is held on by basically the whole engine. And unless you have a 7-bolt, isn't going anywhere.
__________________
2013 Chevy Sonic 1LZ Daily Driver, 1.4L Turbo, 6spd 75 Monte Carlo SBC 400 6.6L, Aluminum heads, Hurricane Intake... 12 Chevy Sonic 1LZ 1.8L - Traded 01 Pontiac Grand Am SE - RIP 95 Eagle Talon ESi-T 5spd - RIP 88 Oldsmobile Cutlass Ciera- RIP
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